Re: [PATCH] iio: dac: ad3552r-hs: fix out-of-bound write in ad3552r_hs_write_data_source

[David Lechner]

On 10/27/25 10:07 AM, Miaoqian Lin wrote:
> When simple_write_to_buffer() succeeds, it returns the number of bytes
> actually copied to the buffer, which may be less than the requested
> 'count' if the buffer size is insufficient. However, the current code
> incorrectly uses 'count' as the index for null termination instead of
> the actual bytes copied, leading to out-of-bound write.
> 
> Add a check for the count and use the return value as the index.
> 
> Found via static analysis. This is similar to the
> commit da9374819eb3 ("iio: backend: fix out-of-bound write")
> 
> Fixes: b1c5d68ea66e ("iio: dac: ad3552r-hs: add support for internal ramp")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Miaoqian Lin <linmq006@xxxxxxxxx>
> ---
Reviewed-by: David Lechner <dlechner@xxxxxxxxxxxx>